Does bypassio (directstorage) require 4k clusters on NTFS

Hi guys, simple question, do you know if using a larger cluster size such as 8k or 16k restricts the user of bypassIO? I had a look at the Microsoft learn page and cluster size is not mentioned so I am hopeful its not a feature restricted to 4k cluster partitions.

It’s not mentioned because it doesn’t matter, as far as BypassIO is concerned. Might affect performance, but that’s what testing is for.

BypassIO still uses the normal file system. What it does is shortcut the I/O requests directly to the disk device driver, instead of stepping through the partition/volume layers and bypassing any kernel mini-filters (which might be handing volume management or real-time security).

Cluster size only exists as a feature of the filesystem. The underlying partition and volume below the filesystem don't have a cluster size, they just track a span of logical disk blocks which correspond to a partition. Underneath it, the physical disk has a logical block size. If the disk wants to do 4K blocks, then 8K or 16K cluster size means some extra buffering is going on.

But that would happened even if BypassIO wasn't used.